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Goodwill and Intangible Assets - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Goodwill [Line Items]        
Acquisitions     $ 5,493  
Amortization of other intangible assets $ 2,854 $ 2,314 5,655 $ 4,645
Forensic and Litigation Consulting        
Goodwill [Line Items]        
Acquisitions $ 5,500   $ 5,493